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The design of structure and the control logic of aircraft power supply system are important parts of aircraft system design, which concern its reliability, redundancy and fault tolerance performance. Digital simulation modeling research and optimization are carried out on completed the aircraft power system. Simulation models including AC generator, TRU (Transformer Rectifier Unit), contactor, overvoltage-undervoltage and overfrequency-underfrequency detection modules are built in Dymola software which can be applicated in a variety of physical systems. The power system is established with these component models and then using the Modelica language to complete the system logic design. Simulation results show that the power system model meets the design requirements. Automatic distribution, automatic fault isolation and it provide the theoretical basis for aircraft power supply system. 